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Neutron Capture Cross Section of Unstable Ni-63: Implications for Stellar Nucleosynthesis

Authorsn_TOF Collaboration; Lederer, Claudia; Domingo Pardo, César ; Giubrone, Giuseppe ; Taín, José Luis
KeywordsS-process nucleosynthesis
Massive stars
Issue Date8-Jun-2013
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 110 (2): 022501 - 5 (2013)
AbstractThe Ni-63(n, gamma) cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged cross sections were calculated for thermal energies from kT = 5-100 keV with uncertainties around 20%. Stellar model calculations for a 25M(circle dot) star show that the new data have a significant effect on the s-process production of Cu-63, Ni-64, and Zn-64 in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova. DOI: 10.1103/PhysRevLett.110.022501
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.110.022501
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